The 2500 and up Series trucks have bumpers that weigh from 165 lbs to 207 lbs, depending on the style of brush guard you choose.
The Bumper will not affect how the airbags deploy. There is a sensor within the car, not located on the bumper, which tells the bag to inflate. Inflation happens when there is a collision force equal to running into a brick wall at 10 to 15 miles per hour (16 to 24 km per hour). A mechanical switch is flipped when there is a mass shift that closes an electrical contact, telling the sensors that a crash has occurred. The sensors receive information from an accelerometer built into a microchip.